Chemistry B Topic Test 1

Which best describes two counteracting forces on an object?

• using a dolly to push a box to another location

• two children pulling apart a wishbone

• a group of dogs pulling a dogsled across ice

• two people pushing a broken-down car up the road

Emmett is lifting a box vertically. Which forces are necessary for calculating the total force?

• Fp, Ff, and Fg

• Fp and F_N

• Fp, Fg, and Ff

• Fp and Fg

Which best explains parallel forces?

• left and right forces that can be added together

• right and upward forces that cancel each other out

• addition of parallel forces that cannot result in a negative force

• left and downward forces that cancel each other out

Jill is pushing a box across the floor. Which represents the upward force perpendicular to the floor?

• Fp

• Ff

• F_N

• Fg

Jasper and Gemma are going to play on a teeter totter. Gemma gets on first. When Jasper gets on, Gemma moves into the air, but she does not move to the top.

Which statement could correctly explain the forces acting on the teeter totter?

Assume that Jasper and Gemma are the same distance from one another.

• The forces are balanced because Jasper weighs the same as Gemma.

• The forces are unbalanced because Jasper weighs the same as Gemma.

• The forces are balanced because Jasper weighs more than Gemma.

• The forces are unbalanced because Jasper weighs more than Gemma.

Which force best represents Fg?

• A weight lifter is pushing a barbell upward with a force of 90 N.

• The weight of a barbell acting on a weight lifter is 80 N.

• The amount of upward force of a table on a box is 25 N.

• A box on a rough table has difficulty sliding past 25 N of force.

Polly is pushing a box across the floor with a force of 30 N. The force of gravity is –8 N, and the normal force is 8 N. Which value could describe the force of friction if Polly could not move the box?

• –30 N

• –8 N

• 8 N

• 30 N

Diego is trying to lift a piano to the second floor of his house. Diego uses a pulley system and gives a big lift to the piano.The piano moves upward, then stops, and then it starts to fall to the ground. (The direction of the force of gravity is negative.)

Which list best describes the forces on the piano in the proper order?

• positive force → balanced force → negative force

• negative force → balanced force → positive force

• positive force → unbalanced force → negative force

• negative force → unbalanced force → positive force

If forces acting on an object are unbalanced, the object could experience a change in ________.

• mass, speed, or direction

• negative acceleration or mass

• direction, mass, or both

• speed, direction, or both

The table re[resents the forces on four objects, with directions.

Which best explains the forces acting on the objects?

• Objects W and X have balanced forces, and objects Y and Z have unbalanced forces.

• Objects W and Y have balanced forces, and objects X and Z have unbalanced forces.

• Objects X and Y have balanced forces, and objects W and Z have unbalanced forces.

• Objects X and Z have balanced forces, and objects W and Y have unbalanced forces.